I used to have 400 backlinks in backlinkwatch.com now only 100. The most depressing part is when i check my Googl backlinks using iwebtool com/backlink_checker, it says zero. I tried a couple other tools and they are all saying zero. in google webmaster tools, it says they have found 70 backlinks to me, whereas before it was more like 380. why are my backlinks dropping? is it possible that the websites that I exchanged links with have deleted my link? how do i check? is there a tool that checks your backlinks periodically to make sure your partners have not deleted your link?